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Tuberculosis (TB)


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Reported Tuberculosis in the United States, 2020					minus icon
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			National DataState & Local DataRisk FactorsDemographicsTB Treatment and Case OutcomesDrug-Resistant TBGenotype ClustersEstimates of Recent Transmission					Related Pages
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Estimates of Recent TransmissionOn This Page
			HighlightsRisk FactorsDemographicsData TablesHighlightsControl of recent transmission is an essential component of the national strategy to eliminate TB disease in the United States. CDC uses genotyping data to estimate the number of TB cases that are attributed to recent transmission. Estimates are based on whether a TB case has a plausible source case with a matching genotype in a person with TB disease who resides within 10 miles and was diagnosed within 2 years prior to the case.
State and local TB programs may use these estimates to monitor trends in their jurisdictions, and to assist in planning and prioritizing TB control activities.
The number of cases attributed to recent transmission declined by 10.8%, from 1,712 in 2017–2018 to 1,527 during 2019–2020.
Genotyped TB Cases Estimated to be Attributed to Recent Transmission, United States, 2019–2020 (N=12,242)resize iconView LargerCloseGenotyped TB Cases Estimated to be Attributed to Recent Transmission, United States, 2019–2020 (N=12,242)download iconDownload Image[PNG]
The 12.5% of genotyped cases attributed to recent transmission during 2019–2020 is comparable to the previous 2-year period 2017–2018 (12.6%).
While estimates of recent transmission vary across reporting areas, all but seven reporting areas had at least one case reported in 2019–2020 that was attributed to recent transmission (TB Estimated to be Attributed to Recent Transmission: Reporting Areas, 2019–2020).Although 71.5% of reported TB cases were among non-U.S.–born persons during 2019–2020 (TB by Origin of Birth: 1993–2020), most cases (54.7%) attributed to recent transmission were among U.S.-born persons (Characteristics of TB Estimated to be Attributed to Recent Transmission: 2019–2020).Risk FactorsThe percentage of TB cases attributed to both recent transmission and extensive recent transmission increased in 2019–2020 compared with 2017–2018 in some groups at increased risk for TB.
Among persons with TB disease who reported injection drug use during 2019–2020, 33.3% and 13.2% were attributed to recent transmission and extensive recent transmission, respectively; in the previous 2-year period the percentages were 20.5% and 6.0%.
Among persons who were incarcerated at the time of evaluation for TB disease during 2019–2020, 21.0% and 14.6% were attributed to recent transmission and extensive recent transmission, respectively, compared with 15.8% and 6.3% in the previous 2-year period.See the Risk Factors webpage for more information.DemographicsPercentages of TB Cases Estimated to be Attributed and Not Attributed to Recent Transmission, by Origin of Birth,* 2019–2020resize iconView LargerClosePercentages of TB Cases Estimated to be Attributed and Not Attributed to Recent Transmission, by Origin of Birth,* 2019–2020download iconDownload Image[PNG]
Disparities in the estimated percentage of cases attributed to recent transmission and extensive recent transmission persist among certain racial and ethnic minority groups.
The percentage of recent transmission is highest among American Indian or Alaska Native persons and was 44.6% in 2019–2020 compared with 40.4% in 2017–2018.See the Demographics webpage for more information.
Learn more in the Estimates of Recent Transmission Narrative and Executive Commentary.Data Tables
Open All Close AllEstimates of Recent TransmissionFigure 1. Estimated Cases Attributed to Recent Transmission of TB, United States, 2019–2020
Figure 2. Estimated Percentage of Extensive Recent Transmission of TB, United States, 2019–2020
TB Estimated to be Attributed to Recent Transmission: Reporting Areas, 2019–2020
TB Estimated to be Attributed to Recent Transmission: Counties with >5 Percent Estimated Extensive Recent Transmission, 2019–2020
Characteristics of TB Cases Estimated to be Attributed to Recent Transmission: 2019–2020Top of Page
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						Page last reviewed:  October 25, 2021					Content source: 	Division of Tuberculosis Elimination, National Center for HIV, Viral Hepatitis, STD, and TB Prevention, Centers for Disease Control and Prevention homeTuberculosisBasic TB Factsplus iconHow TB SpreadsLatent TB Infection and TB DiseaseSigns & SymptomsTB Risk FactorsExposure to TBTB PreventionVaccinesTB & HIV CoinfectionTB and DiabetesTB TermsPersonal StoriesTesting & Diagnosisplus iconWho Should be TestedTesting for TB InfectionTesting in BCG-Vaccinated PersonsTB Screening and Testing of Health Care PersonnelTesting During PregnancyDiagnosing latent TB infection and TB diseaseTreatmentplus iconDeciding When to Treat Latent TB InfectionTreatment Regimens for Latent TB Infection (LTBI)Treatment for TB DiseaseAdverse EventsTB Treatment of Persons Living with HIVTB Treatment and PregnancyTB Treatment for ChildrenFrequently Asked QuestionsDrug-Resistant TBResearchplus iconTB Epidemiologic Studies Consortiumplus iconResearch ProjectsPublicationsTB Trials Consortiumplus iconStudy DescriptionsBackgroundBehavioral & Social Science ResearchHealth Care Settingsplus iconTB Infection Control in Health Care SettingsResources for TB Screening and Testing of Health Care Personnelplus iconFrequently Asked QuestionsTB in Specific Populationsplus iconHealth DisparitiesAsian PersonsBlack or African American PersonsHispanic or Latino PersonsChildrenPregnancyCorrectional FacilitiesPeople Experiencing HomelessnessInternational TravelersLaboratory Informationplus iconDrug Susceptibility TestingFalse-Positive Investigation ToolkitInterim Laboratory Biosafety Guidance for XDR  tuberculosis strainsModel Performance Evaluation Program (MPEP)Rapid Molecular Testing to Detect Drug-Resistant TB in the USplus iconExecutive SummaryIntroductionBackground on Tests for Molecular Detection of DRGeneral Considerations and Principles for a Molecular DR Testing ServicePossible Scenarios and Scope of Testing for a Molecular DR Testing ServiceResearch NeedsGeneral Recommendations of the Expert PanelCommunication Plan for the ReportRecommendationsReferencesPanel Members and CDC ParticipantsAppendix 1Appendix 2Appendix 3The Uses of Nucleic Acid Amplification Tests for the Diagnosis of TBplus iconGeneral ConsiderationsGeneral Recommendations of the Expert PanelRecommendations to ACET, CDC, DTBEData & Statisticsplus iconTB Incidence in the United StatesReported TB in the US, 2022 Surveillance Reportplus iconNational DataReporting Area DataRisk FactorsDemographicsTB Treatment and Case OutcomesDrug-Resistant TBMolecular SurveillanceTuberculosis in the United States, 2022 (Slide Set)Archived Surveillance Reports and Slide Sets2021 State and City ReportArchived State and City ReportsProfessional Resources & Toolsplus iconTools for Healthcare ProvidersResources for TB Programsplus iconStrengthening Civil Surgeons’ Capacity to Improve LTBI Surveillance and Outcomes Among Status AdjustersNotice of Funding Opportunity (NOFO)Program EvaluationTB Centers of ExcellenceTB Elimination AllianceTB Genotypingplus iconConventional TB GenotypingWhole Genome SequencingTB GIMSAnalytic ToolsLatent Tuberculosis Infection ResourcesPublications & Productsplus iconPatient and Public MaterialsFact SheetsGuidelinesplus iconControl & EliminationDrug-Resistant TBInfection Control & PreventionLaboratory & GenotypingTB & HIVTB in Specific PopulationsTesting & DiagnosisTreatmentVaccines & ImmunizationsArchived TB GuidelinesGuides & Toolkitsplus iconAggregate ReportsCDC TB Surveillance TrainingCore CurriculumEffective TB Interviewing for Contact InvestigationEthnographic GuidesFalse-Positive Investigation ToolkitForging Partnerships to Eliminate TuberculosisGuide to Application of GenotypingLTBI: A Guide for Primary Health Care ProvidersMantoux Tuberculin Skin Testing ProductsReport of Verified Case of Tuberculosis (RVCT)Self-Study ModulesTB Contact Investigation Interviewing Skills CourseTB eDOT ToolkitUnderstanding the TB Cohort Review ProcessNewslettersplus iconTB Notes, No. 4, 2023TB Notes, No. 3, 2023TB Notes. No. 2, 2023TB Notes. No. 1, 2023TB Notes, No. 4, 2022TB Notes, No. 3, 2022TB Notes, No. 2, 2022TB Notes, No. 1, 2022TB Notes, No. 4, 2021TB Notes, No. 3, 2021TB Notes, No. 2, 2021TB Notes, No. 1, 2021Pamphlets, Brochures, Bookletsplus iconQuestions and AnswersPatient Education SeriesTuberculosis - Get the FactsTuberculosis - The Connection between TB and HIV12-Dose Regimen for Latent TB Infection-Patient Education BrochurePostersplus iconMantoux Tuberculin Skin Test Wall ChartWorld TB DayThink TBStop TBTake on TBReports & Articlesplus iconDTBE Authored Journal ArticlesTuberculosis Laboratory Aggregate ReportsSlide Setsplus iconIntroduction to TuberculosisEpidemiology of Tuberculosis Among Non-U.S.​–Born Persons in the United States, 1993–2016Self-Study Modules on Tuberculosis, 1-5 Slide SetsThe Tuberculosis (TB) in Correctional Settingsplus iconFacilitator GuideIntroduction to TB GenotypingEpidemiology of Tuberculosis in Correctional Facilities, United States, 1993-2017Prevention and Control of Tuberculosis in Correctional and Detention FacilitiesGuidelines for Preventing the Transmission of M. TB in Health care SettingsInvestigation of Contacts of Persons with Infectious TBEpidemiology of Pediatric Tuberculosis in the United StatesTargeted Tuberculosis Testing and Treatment of Latent Tuberculosis InfectionElectronic Tools & ResourcesWeb-Based Courses & Webinarsplus iconTB 101 for Health Care WorkersContent SyndicationInfographicsplus iconSocial Media GraphicsCustomizable Take on TB Infographic with InstructionsEventsWorld TB Dayplus iconU.S. TB ChampionsHistoryFeaturesplus iconTB Risk FactorsTreating Latent TB Infection with Short-Course RegimensWorld Tuberculosis (TB) Day 2021World Tuberculosis (TB) Day 2020Linksplus iconState TB Control OfficesAbout Usplus iconMission Statement and Activitiesplus iconDTBE Strategic PlanNational TB Program ObjectivesOrganization ChartAdvisory Groupsplus iconFederal TB Task Force To receive email updates about this page, enter your email address: Email Address			What's this?				Submit


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